turn on extended Clang warnings on Windows too

Plus some small rearrangements of the various warning lists.

Change-Id: Ied58f940341d69ddab971a529fd01b1e96b65641
Reviewed-on: https://skia-review.googlesource.com/67720
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
diff --git a/src/utils/win/SkWGL_win.cpp b/src/utils/win/SkWGL_win.cpp
index 016b61b..0c1752a 100644
--- a/src/utils/win/SkWGL_win.cpp
+++ b/src/utils/win/SkWGL_win.cpp
@@ -381,7 +381,7 @@
                 SK_WGL_CONTEXT_PROFILE_MASK,  SK_WGL_CONTEXT_CORE_PROFILE_BIT,
                 0,
             };
-            for (int v = 0; v < SK_ARRAY_COUNT(kCoreGLVersions) / 2; ++v) {
+            for (size_t v = 0; v < SK_ARRAY_COUNT(kCoreGLVersions) / 2; ++v) {
                 coreProfileAttribs[1] = kCoreGLVersions[2 * v];
                 coreProfileAttribs[3] = kCoreGLVersions[2 * v + 1];
                 glrc = extensions.createContextAttribs(dc, shareContext, coreProfileAttribs);
@@ -423,7 +423,7 @@
 
     int pixelFormatsToTry[] = { -1, -1 };
     get_pixel_formats_to_try(dc, extensions, true, msaaSampleCount, deepColor, pixelFormatsToTry);
-    for (int f = 0;
+    for (size_t f = 0;
          !set && -1 != pixelFormatsToTry[f] && f < SK_ARRAY_COUNT(pixelFormatsToTry);
          ++f) {
         PIXELFORMATDESCRIPTOR pfd;